Calumon is a unique Digimon, unable to Digivolve nor can be digi-modified, but is able to make the Digimons digivolve. He does not play any particular role in any of the Books but he has revealed to be quite opmistic and helpful.

In the series, Calumon was revealed to be a childish Digimon, always wanting to play. He is also the only Digimon in the series who does not have a Tamer. However, he shared a special bond with Jeri when the two were trapped in the Kernel Sphere.